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Phase-mapping of periodically domain-inverted LiNbO3 with coherent X-rays

Phase-mapping of periodically domain-inverted LiNbO3 with coherent X-rays
Phase-mapping of periodically domain-inverted LiNbO3 with coherent X-rays
A varying refractive index across a wavefront leads to a change in the direction of propagation of the wave. This provides the basis for phase-contrast imaging of transparent or weakly absorbing materials with highly coherent X-ray beams. Lattice distortions can also change the direction of propagation of a wave field diffracted from a crystal. Here we report the use of this principle to effect phase-contrast imaging of the domain structure of a ferroelectric material, lithium niobate. A periodically domain-inverted structure for quasi-phase-matching of second-harmonic generation is created in this material, in which the direction of spontaneous polarization is sequentially inverted. Because of complex interactions during domain-inversion processing, this is accompanied by lattice distortions across the domain walls. These distortions split the diffracted wavefront of a beam of coherent X-rays from an advanced synchrotron source, giving rise to a pattern of interference that reflects the underlying pattern of lattice distortions. These results show that this phase-contrast imaging technique with sub-micrometre spatial resolution permits the non-destructive, highly sensitive phase-mapping of various structural defects and distortions introduced into materials during processing.
0028-0836
690-693
Hu, Z.W.
61b9c7ba-82f5-46e7-b841-bbcd7f9b5aac
Thomas, P.A.
63105350-ea12-4690-8184-e9da00a6fb28
Snigirev, A.
9ab65de8-19bd-409f-8b9d-ea19f7132627
Snigireva, I.
b0959867-b831-4be1-ba6a-6a3eddcc14a5
Souvorov, A.
2a4a1d0c-7cbd-4873-a680-d33d258214b9
Smith, P.G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Ross, G.W.
e881119e-2126-442e-a24d-506dac48a4a4
Teat, S.
5b7672e9-dc09-46fa-a7d1-49b47eabc7f8
Hu, Z.W.
61b9c7ba-82f5-46e7-b841-bbcd7f9b5aac
Thomas, P.A.
63105350-ea12-4690-8184-e9da00a6fb28
Snigirev, A.
9ab65de8-19bd-409f-8b9d-ea19f7132627
Snigireva, I.
b0959867-b831-4be1-ba6a-6a3eddcc14a5
Souvorov, A.
2a4a1d0c-7cbd-4873-a680-d33d258214b9
Smith, P.G.R.
8979668a-8b7a-4838-9a74-1a7cfc6665f6
Ross, G.W.
e881119e-2126-442e-a24d-506dac48a4a4
Teat, S.
5b7672e9-dc09-46fa-a7d1-49b47eabc7f8

Hu, Z.W., Thomas, P.A., Snigirev, A., Snigireva, I., Souvorov, A., Smith, P.G.R., Ross, G.W. and Teat, S. (1998) Phase-mapping of periodically domain-inverted LiNbO3 with coherent X-rays. Nature, 392, 690-693. (doi:10.1038/33637).

Record type: Article

Abstract

A varying refractive index across a wavefront leads to a change in the direction of propagation of the wave. This provides the basis for phase-contrast imaging of transparent or weakly absorbing materials with highly coherent X-ray beams. Lattice distortions can also change the direction of propagation of a wave field diffracted from a crystal. Here we report the use of this principle to effect phase-contrast imaging of the domain structure of a ferroelectric material, lithium niobate. A periodically domain-inverted structure for quasi-phase-matching of second-harmonic generation is created in this material, in which the direction of spontaneous polarization is sequentially inverted. Because of complex interactions during domain-inversion processing, this is accompanied by lattice distortions across the domain walls. These distortions split the diffracted wavefront of a beam of coherent X-rays from an advanced synchrotron source, giving rise to a pattern of interference that reflects the underlying pattern of lattice distortions. These results show that this phase-contrast imaging technique with sub-micrometre spatial resolution permits the non-destructive, highly sensitive phase-mapping of various structural defects and distortions introduced into materials during processing.

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Published date: 16 April 1998

Identifiers

Local EPrints ID: 77784
URI: https://eprints.soton.ac.uk/id/eprint/77784
ISSN: 0028-0836
PURE UUID: fb4883d1-dafe-4df7-881a-ae651e3273f3
ORCID for P.G.R. Smith: ORCID iD orcid.org/0000-0003-0319-718X

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Date deposited: 11 Mar 2010
Last modified: 05 Nov 2019 02:02

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Contributors

Author: Z.W. Hu
Author: P.A. Thomas
Author: A. Snigirev
Author: I. Snigireva
Author: A. Souvorov
Author: P.G.R. Smith ORCID iD
Author: G.W. Ross
Author: S. Teat

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